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[" A solid compound X on heating gives C...

[" A solid compound X on heating gives CO gass and a residue.The residue mixed with water foms "Y" ; "],[" on passing an excess of "CO_(2)" the "Y" in water,a clear solution "Z" is obtained.On boiling "Z],[" compound,"x" is reformed.The compound "x" is "],[[" (A) "CaCO_(3)," (B) "Na_(2)CO_(3)," (C) "K_(2)CO_(3)," (D) "Ca(HCO_(3))_(2)]]

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